Upworthy - Obama
Reddit - Obama though with a strong base for Johnson
Tumblr - Obama though most people who read this didn't vote for obvious reasons.
Facebook - Obama
Twitter - Obama
Hulu - Obama
Netflix - Obama
Buzzfeed - Obama
Vox - not sure
FiveThirtyEight - Obama
marxists.org - Stein
Gawker - not sure
Jezebel - probably Obama
TV Tropes - Obama
Huffington Post - Obama
IMDB - Obama
The Onion - Obama
Clickhole - Obama
The AV Club - Obama
4chan - hard to call. I think 4chan's lost a lot of influence lately, so perhaps Johnson
LiveJasmin - again hard to call. Not 100% familiar with the side, but a sex chat side IMO would have a strong base of creepy MRA's or edgy teenagers, so perhaps Johnson?
Stormfront - Goode
Dave Leip's US Election Atlas - Obama